Which one of the following statement is not true ?
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a
oxides of sulphur, nitrogen and carbon are the most wide spread air pollutant
b
pH of drinking water should be between 5.5 - 9.5
c
concentration of DO below 6ppm is good for the growth of fish
d
clean water would have a BOD value of less than 5ppm
answer is C.
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Detailed Solution
dissolved oxygen in water is very important for aquatic life . If the concentration of dissolved oxygen of water is below 6 ppm, the growth of fish gets inhibited.